import Vue from 'vue'
/* 路由基本使用
1：安装vue-router   npm i vue-router
2：导入vue-router   import VueRouter from 'vue-router'
3：注册  Vue.use(vue-router)
4: 实例化VueRouter  const router = new VueRouter({routes:[//写相应的路由配置]})
    输出 该路由实例化对象  export default router
5：注入到vue实例 new Vue({router})
    导入路由实例化对象
    import router form "路径"
    new Vue({router})
6：来一个路由出口  router-view
*/

// 2、导入vue-router
import VueRouter from 'vue-router'
import Login from '@/components/Login.vue'
import Home from '@/components/Home.vue'
import Welcome from '@/components/Welcome.vue'
import Users from '@/components/user/User.vue'
import Rights from '@/components/power/Rights.vue'
import Roles from '@/components/power/Roles.vue'
import Cate from '@/components/goods/Cate.vue'
import Params from '@/components/goods/Params.vue'
import GoodsList from '@/components/goods/List.vue'
import Add from '@/components/goods/Add.vue'
import Order from '@/components/order/Order.vue'
import Report from '@/components/report/Report.vue'


// 3、注册 Vue.use(vue-router)
Vue.use(VueRouter)

const router = new VueRouter({
    // 写相应的路由配置
    routes: [
        { path: '/', redirect: '/login' },
        { path: '/login', component: Login },
        {
            path: '/home', component: Home, redirect: '/welcome', 
            children: [
                { path: '/welcome', component: Welcome },
                { path: '/users', component: Users },
                { path: '/rights', component: Rights },
                { path: '/roles', component: Roles },
                { path: '/categories', component: Cate },
                { path: '/params', component:Params },
                { path: '/goods', component:GoodsList },
                { path: '/goods/add', component:Add },
                { path: '/orders', component:Order },
                { path: '/reports', component:Report }
            ]
        }
    ]
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
    // to 将要访问的路径
    // from 代表从哪个路径跳转而来
    // next 是一个函数，表示放行
    //     next()  放行   next('/login')  强制跳转

    // 如果用户访问的登录页，直接放行
    if (to.path === '/login') return next()
    // 获取 token
    // 从 sessionStorage中获取到保存的 token 值
    const tokenStr = window.sessionStorage.getItem('token')
    // 没有token,强制跳转到登录页
    if (!tokenStr) return next('/login')
    next()
})

//输出  出去
export default router